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</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink">数值库</strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"> <a href="numeric/math.html" title="cpp/numeric/math">常用数学函数</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="numeric/special_functions.html" title="cpp/numeric/special functions">数学特殊函数</a> <span class="t-mark-rev t-since-cxx17">(C++17)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="numeric/constants.html" title="cpp/numeric/constants">数学常数</a> <span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="numeric/fenv.html" title="cpp/numeric/fenv">浮点环境</a> <span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="numeric/complex.html" title="cpp/numeric/complex">复数</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="numeric/valarray.html" title="cpp/numeric/valarray">数值数组</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="numeric/random.html" title="cpp/numeric/random">伪随机数生成</a> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="numeric/ratio.html" title="cpp/numeric/ratio">编译时有理数算术</a> <span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>
<tr class="t-nv-h2"><td colspan="5">数值算法</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/gcd.html" title="cpp/numeric/gcd"><span class="t-lines"><span>gcd</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/lcm.html" title="cpp/numeric/lcm"><span class="t-lines"><span>lcm</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">插值</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/midpoint.html" title="cpp/numeric/midpoint"><span class="t-lines"><span>midpoint</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/lerp.html" title="cpp/numeric/lerp"><span class="t-lines"><span>lerp</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">通用数值运算</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="algorithm/iota.html" title="cpp/algorithm/iota"><span class="t-lines"><span>iota</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="algorithm/accumulate.html" title="cpp/algorithm/accumulate"><span class="t-lines"><span>accumulate</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="algorithm/inner_product.html" title="cpp/algorithm/inner product"><span class="t-lines"><span>inner_product</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="algorithm/adjacent_difference.html" title="cpp/algorithm/adjacent difference"><span class="t-lines"><span>adjacent_difference</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="algorithm/partial_sum.html" title="cpp/algorithm/partial sum"><span class="t-lines"><span>partial_sum</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">位操作</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/bit_cast.html" title="cpp/numeric/bit cast"><span class="t-lines"><span>bit_cast</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/has_single_bit.html" title="cpp/numeric/has single bit"><span class="t-lines"><span>has_single_bit</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/bit_ceil.html" title="cpp/numeric/bit ceil"><span class="t-lines"><span>bit_ceil</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/bit_floor.html" title="cpp/numeric/bit floor"><span class="t-lines"><span>bit_floor</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/bit_width.html" title="cpp/numeric/bit width"><span class="t-lines"><span>bit_width</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/rotl.html" title="cpp/numeric/rotl"><span class="t-lines"><span>rotl</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/rotr.html" title="cpp/numeric/rotr"><span class="t-lines"><span>rotr</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/countl_zero.html" title="cpp/numeric/countl zero"><span class="t-lines"><span>countl_zero</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/countl_one.html" title="cpp/numeric/countl one"><span class="t-lines"><span>countl_one</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/countr_zero.html" title="cpp/numeric/countr zero"><span class="t-lines"><span>countr_zero</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/countr_one.html" title="cpp/numeric/countr one"><span class="t-lines"><span>countr_one</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="numeric/popcount.html" title="cpp/numeric/popcount"><span class="t-lines"><span>popcount</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="types/endian.html" title="cpp/types/endian"><span class="t-lines"><span>endian</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<p>C++ 数值库包含常用数学函数及类型，以及优化的数值数组及对随机数生成的支持。
</p>
<h2><span class="mw-headline" id=".E6.95.B0.E5.AD.A6.E5.87.BD.E6.95.B0.E4.B8.8E.E7.B1.BB.E5.9E.8B">数学函数与类型</span></h2>
<h3><span class="mw-headline" id=".E5.B8.B8.E7.94.A8.E6.95.B0.E5.AD.A6.E5.87.BD.E6.95.B0"><a href="numeric/math.html" title="cpp/numeric/math">常用数学函数</a></span></h3>
<p>头文件 <a href="header/cmath.html" title="cpp/header/cmath"><tt>&lt;cmath&gt;</tt></a> 提供<a href="numeric/math.html" title="cpp/numeric/math">标准 C 库数学函数</a>，例如 <span class="t-lc"><a href="numeric/math/fabs.html" title="cpp/numeric/math/fabs">std::fabs</a></span> 、 <span class="t-lc"><a href="numeric/math/sqrt.html" title="cpp/numeric/math/sqrt">std::sqrt</a></span> 及 <span class="t-lc"><a href="numeric/math/sin.html" title="cpp/numeric/math/sin">std::sin</a></span> 。
</p>
<h3><span class="mw-headline" id=".E6.95.B0.E5.AD.A6.E7.89.B9.E6.AE.8A.E5.87.BD.E6.95.B0_.28C.2B.2B17_.E8.B5.B7.29"><a href="numeric/special_functions.html" title="cpp/numeric/special functions">数学特殊函数</a> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></h3>
<p>头文件 <a href="header/cmath.html" title="cpp/header/cmath"><tt>&lt;cmath&gt;</tt></a> 亦提供数个特殊数学函数，例如 <span class="t-lc"><a href="numeric/special_math/beta.html" title="cpp/numeric/special math/beta" class="mw-redirect">std::beta</a></span> 、 <span class="t-lc"><a href="numeric/special_math/hermite.html" title="cpp/numeric/special math/hermite" class="mw-redirect">std::hermite</a></span> 及 <span class="t-lc"><a href="numeric/special_math/cyl_bessel_i.html" title="cpp/numeric/special math/cyl bessel i" class="mw-redirect">std::cyl_bessel_i</a></span> 。
</p>
<h3><span class="mw-headline" id=".E6.95.B0.E5.AD.A6.E5.B8.B8.E6.95.B0_.28C.2B.2B20_.E8.B5.B7.29"><a href="numeric/constants.html" title="cpp/numeric/constants">数学常数</a> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span></span></h3>
<p>头文件 <a href="header/numbers.html" title="cpp/header/numbers"><tt>&lt;numbers&gt;</tt></a> 提供数个数学常数，例如 <span class="t-lc">std::numbers::pi</span> 或 <span class="t-lc">std::numbers::sqrt2</span> 。
</p>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.95.B0.E7.AE.97.E6.9C.AF">复数算术</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;complex&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/complex.html" title="cpp/numeric/complex"> <span class="t-lines"><span>complex</span></span></a></div></div>
</td>
<td>  复数类型 <br> <span class="t-mark">(类模板)</span>
</td></tr>
</table>
<h3><span class="mw-headline" id=".E6.95.B0.E5.80.BC.E6.95.B0.E7.BB.84">数值数组</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;valarray&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/valarray.html" title="cpp/numeric/valarray"> <span class="t-lines"><span>valarray</span></span></a></div></div>
</td>
<td>  数值数组、数组掩码及数组切片 <br> <span class="t-mark">(类模板)</span>
</td></tr>
</table>
<h2><span class="mw-headline" id=".E6.95.B0.E5.80.BC.E7.AE.97.E6.B3.95">数值算法</span></h2>
<p>头文件 <a href="header/numeric.html" title="cpp/header/numeric"><tt>&lt;numeric&gt;</tt></a> 提供下列数值算法：
</p>
<h3><span class="mw-headline" id=".E5.9B.A0.E6.95.B0.E8.BF.90.E7.AE.97">因数运算</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;numeric&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/gcd.html" title="cpp/numeric/gcd"> <span class="t-lines"><span>gcd</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>   返回二个整数最大公约数的 <code>constexpr</code> 函数模板 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/lcm.html" title="cpp/numeric/lcm"> <span class="t-lines"><span>lcm</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>   返回二个整数最小公倍数的 <code>constexpr</code> 函数模板 <br> <span class="t-mark">(函数模板)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E6.8F.92.E5.80.BC.E8.BF.90.E7.AE.97">插值运算</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;numeric&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/midpoint.html" title="cpp/numeric/midpoint"> <span class="t-lines"><span>midpoint</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  两个数值或指针间的中点 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;cmath&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/lerp.html" title="cpp/numeric/lerp"> <span class="t-lines"><span>lerp</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  线性插值函数 <br> <span class="t-mark">(函数)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E6.95.B0.E5.80.BC.E8.BF.90.E7.AE.97">数值运算</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;numeric&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/iota.html" title="cpp/algorithm/iota"> <span class="t-lines"><span>iota</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>   用从起始值开始连续递增的值填充一个范围  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/accumulate.html" title="cpp/algorithm/accumulate"> <span class="t-lines"><span>accumulate</span></span></a></div></div>
</td>
<td>   对一个范围内的元素求和 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/reduce.html" title="cpp/algorithm/reduce"> <span class="t-lines"><span>reduce</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  类似 <span class="t-lc"><a href="algorithm/accumulate.html" title="cpp/algorithm/accumulate">std::accumulate</a></span>，但不依序执行 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/transform_reduce.html" title="cpp/algorithm/transform reduce"> <span class="t-lines"><span>transform_reduce</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>   应用一个函数对象，然后以乱序规约 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/inner_product.html" title="cpp/algorithm/inner product"> <span class="t-lines"><span>inner_product</span></span></a></div></div>
</td>
<td>   计算两个范围的元素的内积  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/adjacent_difference.html" title="cpp/algorithm/adjacent difference"> <span class="t-lines"><span>adjacent_difference</span></span></a></div></div>
</td>
<td>   计算范围内各相邻元素之间的差  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/partial_sum.html" title="cpp/algorithm/partial sum"> <span class="t-lines"><span>partial_sum</span></span></a></div></div>
</td>
<td>   计算范围内元素的部分和 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/inclusive_scan.html" title="cpp/algorithm/inclusive scan"> <span class="t-lines"><span>inclusive_scan</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  类似 <span class="t-lc"><a href="algorithm/partial_sum.html" title="cpp/algorithm/partial sum">std::partial_sum</a></span>，第 i 个和中包含第 i 个输入 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/exclusive_scan.html" title="cpp/algorithm/exclusive scan"> <span class="t-lines"><span>exclusive_scan</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  类似 <span class="t-lc"><a href="algorithm/partial_sum.html" title="cpp/algorithm/partial sum">std::partial_sum</a></span>，第 i 个和中排除第 i 个输入 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/transform_inclusive_scan.html" title="cpp/algorithm/transform inclusive scan"> <span class="t-lines"><span>transform_inclusive_scan</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  应用一个函数对象，然后进行包含扫描 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="algorithm/transform_exclusive_scan.html" title="cpp/algorithm/transform exclusive scan"> <span class="t-lines"><span>transform_exclusive_scan</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  应用一个函数对象，然后进行排除扫描 <br> <span class="t-mark">(函数模板)</span> </td></tr>
</table>
<h2><span class="mw-headline" id=".E6.9D.82.E9.A1.B9">杂项</span></h2>
<h3><span class="mw-headline" id=".E4.BC.AA.E9.9A.8F.E6.9C.BA.E6.95.B0.E7.94.9F.E6.88.90"><a href="numeric/random.html" title="cpp/numeric/random">伪随机数生成</a></span></h3>
<p>头文件 <a href="header/random.html" title="cpp/header/random"><tt>&lt;random&gt;</tt></a> 定义<a href="numeric/random.html" title="cpp/numeric/random">为随机数生成器与数值分布</a>。头文件 <code>cstdlib</code> 亦包含 C 风格随机数生成，通过 <span class="t-lc"><a href="numeric/random/srand.html" title="cpp/numeric/random/srand">std::srand</a></span> 和 <span class="t-lc"><a href="numeric/random/rand.html" title="cpp/numeric/random/rand">std::rand</a></span> 。
</p>
<h3><span class="mw-headline" id=".E7.BC.96.E8.AF.91.E6.97.B6.E6.9C.89.E7.90.86.E6.95.B0.E7.AE.97.E6.9C.AF_.28C.2B.2B11_.E8.B5.B7.29"><a href="numeric/ratio.html" title="cpp/numeric/ratio">编译时有理数算术</a> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span></span></h3>
<p>头文件 <a href="header/ratio.html" title="cpp/header/ratio"><tt>&lt;ratio&gt;</tt></a> 提供<a href="numeric/ratio.html" title="cpp/numeric/ratio">操作和存储编译时比例的类型和函数</a>。
</p>
<h3><span class="mw-headline" id=".E6.B5.AE.E7.82.B9.E7.8E.AF.E5.A2.83_.28C.2B.2B11_.E8.B5.B7.29"><a href="numeric/fenv.html" title="cpp/numeric/fenv">浮点环境</a> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span></span></h3>
<p>头文件 <a href="header/cfenv.html" title="cpp/header/cfenv"><tt>&lt;cfenv&gt;</tt></a> 定义<a href="numeric/fenv.html" title="cpp/numeric/fenv">关系到异常浮点状态的标志和函数</a>，例如上溢和除以零。
</p>
<h3><span class="mw-headline" id=".E4.BD.8D.E6.93.8D.E7.BA.B5_.28C.2B.2B20_.E8.B5.B7.29">位操纵 <span class="t-mark-rev t-since-cxx20">(C++20 起)</span> </span></h3>
<p>头文件 <a href="header/bit.html" title="cpp/header/bit"><tt>&lt;bit&gt;</tt></a> 提供数个访问、操纵及处理单独位和位序列的函数模板。
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;bit&gt;</code> </div>
</td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于命名空间 <code>std</code></div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/bit_cast.html" title="cpp/numeric/bit cast"> <span class="t-lines"><span>bit_cast</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  将一个类型的对象表示重解释为另一类型的对象表示 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/has_single_bit.html" title="cpp/numeric/has single bit"> <span class="t-lines"><span>has_single_bit</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  检查一个数是否为二的整数次幂 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/bit_ceil.html" title="cpp/numeric/bit ceil"> <span class="t-lines"><span>bit_ceil</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  寻找不小于给定值的最小的二的整数次幂 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/bit_floor.html" title="cpp/numeric/bit floor"> <span class="t-lines"><span>bit_floor</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  寻找不大于给定值的最大的二的整数次幂 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/bit_width.html" title="cpp/numeric/bit width"> <span class="t-lines"><span>bit_width</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  寻找表示给定值所需的最小位数 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/rotl.html" title="cpp/numeric/rotl"> <span class="t-lines"><span>rotl</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   计算逐位左旋转的结果  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/rotr.html" title="cpp/numeric/rotr"> <span class="t-lines"><span>rotr</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   计算逐位右旋转的结果  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/countl_zero.html" title="cpp/numeric/countl zero"> <span class="t-lines"><span>countl_zero</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   从最高位起计量连续的 0 位的数量  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/countl_one.html" title="cpp/numeric/countl one"> <span class="t-lines"><span>countl_one</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   从最高位起计量连续的 1 位的数量  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/countr_zero.html" title="cpp/numeric/countr zero"> <span class="t-lines"><span>countr_zero</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   从最低位起计量连续的 0 位的数量  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/countr_one.html" title="cpp/numeric/countr one"> <span class="t-lines"><span>countr_one</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   从最低位起计量连续的 1 位的数量  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="numeric/popcount.html" title="cpp/numeric/popcount"> <span class="t-lines"><span>popcount</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   计量无符号整数中为 1 的位的数量  <br> <span class="t-mark">(函数模板)</span> </td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="types/endian.html" title="cpp/types/endian"> <span class="t-lines"><span>endian</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  指示标量类型的端序 <br> <span class="t-mark">(枚举)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

</table>

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